190-00726-00 Rev. J
Garmin G900X Pilot’s Guide
SY
STEM
O
VER
VIEW
FLIGHT
INSTRUMENTS
EIS
AUDIO P
ANEL
& CNS
FLIGHT
MANA
GEMENT
HAZARD
AV
OID
ANCE
AFCS
ADDITIONAL
FEA
TURES
APPENDICES
INDEX
647
APPENDIX A
GMU 44 MESSAGE ADVISORIES
Message
Comments
HDG FAULT
– AHRS1 magnetometer
fault has occurred.
A fault has occurred in the #1 GMU 44. Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The system should be serviced.
HDG FAULT
– AHRS2 magnetometer
fault has occurred.
A fault has occurred in the #2 GMU 44. Heading is flagged as invalid. The AHRS uses
GPS for backup mode operation. The system should be serviced.
MANIFEST
– GMU1 software
mismatch, communication halted.
The GMU 44 has incorrect software installed. The system should be serviced.
MANIFEST
– GMU2 software
mismatch, communication halted.
GDL 69A MESSAGE ADVISORIES (OPTIONAL)
Message
Comments
GDL69 CONFIG
– GDL 69 config
error. Config service req’d.
GDL 69 configuration settings do not match those of backup configuration memory.
The system should be serviced.
GDL69 FAIL
– GDL 69 has failed.
A failure has been detected in the GDL 69. The receiver is unavailable. The system
should be serviced
MANIFEST
– GDL software mismatch,
communication halted.
The GDL 69 has incorrect software installed. The system should be serviced.
GDC 74A MESSAGE ADVISORIES
Message
Comments
ADC1 ALT EC
– ADC1 altitude error
correction is unavailable.
GDC1 or GDC2 is reporting that the altitude error correction is unavailable.
ADC2 ALT EC
– ADC2 altitude error
correction is unavailable.
ADC1 AS EC
– ADC1 airspeed error
correction is unavailable.
GDC1 or GDC2 is reporting that the airspeed error correction is unavailable.
ADC2 AS EC
– ADC2 airspeed error
correction is unavailable.
MANIFEST
– GDC1 software
mismatch, communication halted.
The GDC 74A has incorrect software installed. The system should be serviced.
MANIFEST
– GDC2 software
mismatch, communication halted.
GCU 476/477 MESSAGE ADVISORIES (OPTIONAL)
Message
Comments
GCU CNFG
– GCU Config error.
Config service req’d.
GCU 476/477 configuration settings do not match those of backup configuration
memory. The system should be serviced.
GCU FAIL
– GCU is inoperative.
A failure has been detected in the GCU 476/477. The GCU 476/477 is unavailable.